Writing and reading both require a model. Expressions hold executable accessors and navigators, while documents carry only their ids; the model is the authority that binds one to the other. Regex operands retain {@link java.util.regex.Pattern} syntax and flag bits.
Everything unrecognised fails. An expression read wrongly does not announce itself — it silently matches the wrong things, and a caller who wanted a filter gets one, just not theirs. ## Members - `SCHEMA` (attribute) — The schema this version reads and writes. Immutable once published. - `write` (method) — Writes an expression as a document for the model that declared all of its fields and relations. - `writeString` (method) — Writes an expression as compact JSON text. - `read` (method) — Reads a document back as an expression over the given model. - `readString` (method) — Reads a document from JSON text.